JP2004217196A - Heat function structure for automobile and vehicle body panel structure used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat function structure for an automobile and a vehicle body panel structure used for the same capable of promoting comfortability in room temperature. <P>SOLUTION: In the heat function structure for the automobile, a vehicle body 50 for partitioning and forming a cabin R is divided into a vehicle upper part 52 and a vehicle lower part 53 with a substantially horizontal border line 52 as a boundary, and the vehicle upper part is provided with a means 61 having the function of heat insulation and the vehicle lower part is provided with a means 62 having the function of heat dissipation. The border line is set, for example, at a substantially central position on a vertical line obtained by connecting an upper end of a door panel and a lower end of a side sill with a perpendicular line from ground level. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a thermal functional structure for a vehicle capable of providing a comfortable indoor temperature environment and a vehicle body panel structure used for the structure, and more particularly, to reduce the indoor atmosphere temperature and the temperature of interior components during parking under hot weather. The present invention relates to a heat insulating and radiating system for a vehicle body capable of shielding external heat and facilitating the release of indoor heat.

  In summer, light and heat can enter the room parked under the scorching sun mainly through a large-area windshield, rear glass, front side glass, rear side glass, roof, and the like.

  In conventional general vehicles, laminated glass is used for the windshield, and single glass is often used for the front side glass. An interlayer is used to improve the strength of the glass, but this interlayer has almost no thermal function. A ceiling material made of a combination of cardboard and nonwoven fabric is used for the ceiling, but a ceiling material having such a configuration has almost no thermal function.

Some of the vehicles actually sold use a small amount of heat insulating material (having a basis weight of 0.26 kg / m ² ) for the ceiling material, while another heat intrusion path, glass, which is a general UV-cut green glass There are vehicles that use laminated glass or single glass (having an infrared absorption function) made of aluminum. In such a vehicle, a remarkable effect of reducing the indoor temperature when the vehicle is stopped cannot be obtained in spite of using a heat insulating material for the ceiling material.

  In the case where there are two heat intrusion paths into the room as described above, if only one of the heat intrusion paths is provided with a heat countermeasure, the effect of the heat countermeasure is reduced when viewed as a whole vehicle. This is because, although taking measures against one of the heat intrusion paths lowers the indoor temperature, the other heat intrusion paths, on which no measures are taken, cause more heat to enter. For example, in the case where two paths of heat intrusion into the room are considered, the glass and the ceiling. If measures are taken only for the glass, the amount of heat input from the glass decreases and the room temperature decreases slightly. On the other hand, the amount of heat input from the ceiling increases, as apparent from the thermal resistance value, and as a result, the decrease in the room temperature decreases. Conversely, the same occurs when a heat insulating material is used for the ceiling material and no measures are taken for the glass. In this case, since no countermeasure is taken for the glass whose energy transmission amount is larger than that of the ceiling, the effect of lowering the room temperature becomes smaller. It should be noted that the same thing can naturally occur with a combination other than the combination of glass and ceiling.

  In a conventional vehicle having such a configuration, it is difficult to say that heat is sufficiently prevented from entering, and the interior temperature of an automobile placed in an environment under hot weather becomes extremely high. In a measurement example in a summer environment in Japan, in the case of parking, the indoor air temperature reaches approximately 70 ° C. At the same time, the temperature of the interior material in the room rises near 100 ° C. on the upper surface of the instrument panel and rises to near 70 ° C. on the ceiling. Not to mention the discomfort of riding in such a situation, even after the ventilation or air-conditioning system has been activated, the temperature of the interior material does not drop easily and radiates radiant heat to the occupants for a long time, greatly reducing comfort. ing.

  2. Description of the Related Art In recent years, various heat countermeasures have been proposed for shielding light and heat energy flowing into a room to reduce the amount of heat that enters, for the purpose of suppressing an increase in room temperature and reducing a cooling load. The reduced heat load in the cabin not only reduces the discomfort of the occupants, but also reduces fuel consumption, and further improves fuel efficiency through weight reduction by downsizing the air conditioning system. Can be

  A vehicle with improved heat insulation is disclosed in Patent Document 1 as a heat-insulated vehicle. In the heat-insulated automobile disclosed in Patent Literature 1, since heat insulating materials are installed at every place, it is difficult to meet the recent demand for reducing the weight of the vehicle. In addition, since the intrusion of heat due to heat conduction of the material used as the heat insulating material is not considered, there is a possibility that the effect of lowering the indoor temperature cannot be sufficiently exhibited.

  With respect to glass for heat insulation, a number of techniques have been proposed as disclosed in Patent Documents 2 to 6. For example, the transmittance of sunlight into a room is reduced by adjusting the composition of the glass to increase the absorption so that the glass absorbs a part of the sunlight. In a current vehicle, taking a windshield glass as an example, the solar radiation transmittance is set to, for example, 45 to 53%. This reduces the amount of solar radiation that passes through the glass and enters the room. However, in the case of glass used for vehicles, visible light transmittance of 70% or more is required by law, and it is difficult to obtain a remarkable heat insulating effect. In addition, when applied to a vehicle, the path of heat entering the room changes, and as described above, further heat enters from another heat entry path other than glass.

  As other heat countermeasures, a heat countermeasure in which ventilation is performed using a solar cell or the like (see Patent Document 7), a light-shielding ventilation structure in which a light-shielding shade is provided to provide a ventilation path (see Patent Document 8), and the like have been proposed. . However, the heat countermeasures described in Patent Literatures 7 and 8 require a new device to be mounted on the vehicle, which may increase weight and cost.

  The cause of the rise in indoor temperature is not only the invasion of solar radiation into the room, the invasion of heat from the body panel that absorbed the solar radiation into the room, but also the escape of heat trapped in the room to the outside and the release of heat. It does not happen.

  The measures against heat applied to the outer panel constituting the vehicle body panel will be further described. Regarding the heat transfer via the outer panel, there are two cases: one is to take measures against the surface of the outer panel, that is, the side that is exposed to solar radiation, and the other is to take measures against the back side of the outer panel. Coating that suppresses the absorption of solar radiation on the panel surface is known, for example, in the construction field, but does not satisfy the application requirements in fields requiring a high degree of design, such as outer panels of vehicles. On the other hand, as a countermeasure against the back surface side of the outer panel, a countermeasure focusing on the surface facing the back surface of the outer panel, that is, the back surface of the interior of the cabin (for example, see Patent Document 9), or the back surface itself of the outer panel is used. A countermeasure focused on (for example, see Patent Document 10) is known.

  Patent Document 9 discloses a technique for lowering the emissivity of the back surface of the interior. This technology reduces the emissivity in most areas of the back of the interior, reflecting heat transfer from the back of the outer plate, mainly radiation, while considering the design of the vehicle, to prevent heat intrusion. Is what you do.

  Patent Literature 10 discloses a technique for improving a room environment by attaching a thin heat insulating material to almost all portions on the back surface of an outer panel.

  However, the technique described in Patent Document 9 has a disadvantage when it is desired to release the heat once entering the room, that is, when radiating heat from the room to the outside. Similarly, the technique described in Patent Document 10 also has a disadvantage when radiating heat from a room to the outside.

There is no prior art that considers the heat radiation of the indoor air, the outer panel and the interior, and there is no one that attempts to improve the indoor environment by performing both heat insulation and heat radiation in a well-balanced manner.
JP 2001-500818 A JP 2001-226148 A JP 2001-151539 A JP 2001-146440 A JP 2001-39841 A JP 2001-39742 A JP-A-9-295509 JP-A-2002-331822 JP 2001-158306 A JP 2002-012094 A

  The present inventors have re-analyzed the flow of heat when the vehicle stops under the scorching sun, based on the above-described current situation. As a result, it has been found that the solar energy incident into the room through the window glass is mainly dissipated by convective heat transfer through the window or vehicle body on the side not receiving the solar radiation. In addition, in the body structure proposed so far, when solar radiation is applied to window glass, etc., the effect of radiant heat is large and heat radiation is emitted to the indoor side, so that the effect of improving the indoor temperature environment is substantially improved. It is thought to be smaller. The present inventors have completed the present invention in view of the above points.

  Therefore, while considering that the object of the present invention can be realized without greatly changing the basic style and manufacturing process of the current vehicle, it is left under the scorching sun by increasing the heat insulating effect of the vehicle body and blocking even the radiant heat. In this case, the room temperature environment is greatly improved.

  Another object of the present invention is to provide an optimal material arrangement to lower the indoor temperature when the vehicle stops under the scorching sun, reduce the temperature load on the human body, and reduce the load at the time of cooling down in the air conditioner. .

  As a path for heat to enter the room, in addition to the above-described roof and windshield, the upper part of the door structure, and pillars A, B, and C may be mentioned. These parts are exposed to the airflow of the outside air during traveling, so that the temperature of the outer surface decreases, and the parts behave as a heat release path to the outside of the vehicle compartment. However, when the vehicle is parked, the airflow on the outer surface of the vehicle compartment is significantly smaller than that during traveling, so that the energy absorbed by each part is radiated into the room as far-infrared rays, and as a result, the room is heated. Immediately after getting on the vehicle, the occupant is forced to have a severe temperature environment.

  In order to solve such a problem, the present inventors paid attention when the vehicle stopped. When the vehicle stops, the temperature of the window glass becomes high, and the temperature decreases in the order of the window glass, the room, and the outside air. For this reason, far infrared rays are radiated from the window glass to both surfaces. Furthermore, the same heat input is caused from the ceiling which is another main heat intrusion path.

  As a result of intensive studies on methods for preventing the invasion of heat, the inventors have devised the following invention that can greatly prevent the invasion of heat into a room.

  Furthermore, the present inventors have found that there is a portion of the outer panel rear surface, a portion of the passenger compartment facing the outer panel that requires heat insulation processing, and a portion suitable for heat radiation. By improving the surface facing the outer panel, the present invention has been completed, which can solve two contradictory problems of radiating heat from parts such as the vehicle body panel and the interior and the room while insulating the vehicle body panel.

  Therefore, an object of the present invention is to suppress the intrusion of heat into the vehicle compartment from a portion of the outer panel that is likely to receive heat, thereby preventing a significant increase in the temperature of the vehicle compartment and the components such as the outer panel and the interior. I aim. Furthermore, it aims at lowering the ambient temperature of the entire vehicle compartment by promoting heat radiation from the vehicle compartment to the outside, and at the same time, lowering the component temperature by releasing the heat absorbed by the component to the outside of the vehicle. As a result, an object is to provide a vehicle that can promote indoor temperature comfort.

  The present invention suppresses the deterioration of the indoor environment due to the intrusion of heat into the room from the outer panel whose temperature has increased due to solar radiation, and promotes heat radiation for improving the deterioration of the indoor environment when the room environment deteriorates. As a means, the above object is achieved by focusing on a thermal functional structure for an automobile and a vehicle body panel structure used for the structure and satisfying the following requirements.

  In other words, the thermal functional structure for an automobile according to the present invention divides a vehicle body for forming a compartment into two parts, an upper body part and a lower body part with a substantially horizontal boundary line as a boundary. While a means having a function is provided, a means having a heat radiation function is provided below the vehicle body.

  Further, the vehicle body panel structure according to the present invention is used for a thermal functional structure for an automobile and forms a substantially vertical surface, and is opposed to the back surface of the outer panel, both surfaces of the inner panel, and the outer panel of the interior trim. At least one of the surfaces is partially or desirably heat-insulated, and at least a part of the portion not subjected to the heat-insulating treatment is provided with a means for facilitating heat radiation.

  ADVANTAGE OF THE INVENTION According to this invention, it has both the heat insulation function and the heat dissipation function in a well-balanced manner, suppresses the invasion of heat from the heat-receiving portion of the outer panel to the vehicle interior, and reduces the parts per se such as the vehicle interior, the outer panel and the interior. Temperature can be prevented from rising significantly, and the ambient temperature of the entire cabin can be reduced by promoting heat radiation from the cabin to the outside. As a result, it is possible to provide a vehicle that can promote indoor temperature comfort.

(1. Thermal functional structure for automobiles)
First, a description will be given of a heat transfer mode when a general vehicle is parked. FIGS. 1 to 3 are conceptual diagrams showing a heat transfer mode when a general vehicle 100 is parked.

  As shown in FIGS. 1 and 2, in a general vehicle 100, when the solar radiation is applied, the members in the passenger compartment R are heated by absorbing the solar radiation, and emit heat by the convective heat transfer to the indoor air. . In the door structure 30 which is one of the vehicle body panel structures, as shown in FIG. 3, the outer panel 31 constituting the exterior of the door is heated by absorbing solar radiation, and the inner panel 32 and the inner panel 32 facing the outer panel 31 are heated. Heat is released by radiant and convective heat transfer to room air through a room trim 33 such as a door trim. As a result, the room temperature increases. Representative members serving as heat radiation sources include a roof 34, a windshield 35, a side glass 36 (a generic name for a front side glass 36 a and a rear side glass 36 b), a window glass such as a rear glass 37, an instrument panel 38, a rear parcel shelf 39, and a seat 40. And the interior trim 33, and the temperature of these members rises, so that the room temperature also rises. This phenomenon is repeated with time, and the room temperature distribution is such that the air temperature above the room becomes extremely high. Furthermore, since the temperature of the members above the vehicle body becomes extremely high, even when the occupant gets on the vehicle, the radiation to the human body due to the radiation is large, which is a major cause of discomfort when getting on the vehicle.

  The operation of the present invention will be described.

  FIG. 4 is a view for explaining the thermal functional structure for an automobile according to the present invention, and is a longitudinal sectional view of the vehicle body 50 as viewed from the front.

  The thermal functional structure for an automobile according to the present invention divides a vehicle body 50 for forming a compartment R into a vehicle body upper portion 52 and a vehicle body lower portion 53 with a substantially horizontal boundary 51 as a boundary. 52 is provided with a means 61 having a heat insulating function, while a lower part 53 of the vehicle body is provided with a means 62 having a heat radiating function.

  The boundary 51 is set, for example, at a substantially central position 58a in a vertical line 58 connecting a door panel upper end 54 and a side sill lower end 55 with a perpendicular 57 from the ground surface 56. The boundary 51 may be included in either the upper body 52 or the lower body 53. In addition, one boundary line 51 may be used, but a plurality of boundary lines 51 may be set in order to determine different boundaries between the side of the vehicle body and the front of the vehicle body.

  Regarding the rise in the temperature of the indoor space when left in the hot sun, the outer panel 31 surrounding the indoor space is heated by solar radiation or the like, and the temperature of the indoor air rises due to heat conduction, radiation, convection heat transfer, and the like. The present inventors have paid attention to the temperature behavior of the outer panel 31 in this mechanism. Assuming that the device is left in the hot sun, the time zone in which the temperature rises remarkably reaches the maximum temperature is from 10:00 am to 2:00 pm. It is found that the portion where the outer panel 31 acts as a heat input portion during this time zone is a portion to which direct sunlight is roughly applied, and the other lower portion 53 of the vehicle body has a low temperature and does not act as a heat input portion. Was done. Therefore, in the present invention, the body temperature is reduced by dividing the vehicle body 50 into the upper body part 52 and the lower body part 53 with the boundary 51 as a boundary and providing separate thermal function means in each part. Is intended.

  Another factor in the rise in the room temperature is a path in which light energy transmitted through the window glasses 35, 36, and 37 is absorbed by the interior material and released into the room as heat energy. The target sites for this phenomenon include the interior trim 33, the cushion of the seat 40, and the like, in addition to the surface of the instrument panel 38, the rear parcel shelf 39, and the like. Among them, a portion having a large effect on an increase in the room temperature is a cushion of the seat seat surface 40a. The position of the seat surface 40a changes depending on the shape and form of the vehicle 100. Automobiles can be classified into vehicle types such as sedan, coupe, and 1BOX according to the vehicle shape. In each vehicle type, the position of the seat seating surface 40a is formed by connecting the upper end 54 of the door panel and the lower end 55 of the side sill by a perpendicular 57 from the ground surface 56. The vertical line 58 is located at a position 58b at a length ratio of 20 to 60% in the upward direction from the side sill lower end 55 with respect to the entire length of the vertical line 58. The present inventors have found that when the boundary line 51 is set at this position 58b and the vehicle body 50 is divided into an upper body portion 52 and a lower body portion 53, the indoor temperature distribution and the heat flow in the entire vehicle 100 are greatly different. Was. This is considered to be due to the fact that the solar radiation directly hits the outside of the vehicle and heat enters the room, and that a portion serving as a heat source in the room serves as a boundary to form a room temperature distribution and a heat flow.

  Therefore, it is possible to reduce the indoor temperature by dividing the vehicle body 50 into an upper body part 52 and a lower body part 53 based on the boundary 51 and providing separate thermal function means in each part. In the present invention, by providing a means having a heat insulating function in the upper part 52 of the vehicle body and a means having a heat radiating function in the lower part 53 of the vehicle body, it is possible to improve the indoor temperature environment when left under the hot sun.

  Hereinafter, an embodiment of a thermal functional structure for an automobile according to the present invention will be described.

  FIG. 5 is a schematic diagram showing a vehicle to which the thermal functional structure for an automobile according to the embodiment and Example 1 described later is applied, and shows a vehicle body 50 in a vertical cross section when viewed from the front.

  In general, the thermal functional structure for an automobile according to the embodiment divides a vehicle body 50 for forming a compartment R into a vehicle upper part 52 and a vehicle lower part 53 with a substantially horizontal boundary 51 as a boundary. Means 61 having a heat insulating function are provided on the upper part 52 of the vehicle body, while means 62 having a heat radiating function are provided on the lower part 53 of the vehicle body. The reason why the upper body 52 and the lower body 53 are divided into two parts with the boundary 51 as a boundary is to separate a part having a large temperature rise and a part having a small temperature rise in the hot weather according to the temperature behavior of the outer panel 31 as described above. is there. The boundary line 51 is set at a substantially central position 58 a in a vertical line 58 connecting the upper end 54 of the door panel and the lower end 55 of the side sill with a perpendicular 57 from the ground surface 56.

  In the general vehicle 100, as shown in FIGS. 1 to 3, since there is no means for radiating heat, heat input from the outside of the vehicle to the room is overwhelmingly large, and in the summer, At present, the indoor temperature reaches an equilibrium at a temperature higher than the outside of the vehicle by 30 ° C. or more.

  On the other hand, in the thermal functional structure according to the embodiment, as shown in FIG. 5, since the upper part 52 of the vehicle body is provided with the means 61 having a heat insulating function, a portion having the largest heat input is insulated. The amount of heat entering the room can be reduced to the maximum. Further, since the lower part 53 of the vehicle body is provided with the means 62 having a heat radiation function, the heat is radiated at the lowest temperature in the vicinity of the outer panel 31, so that the temperature difference between the room and the room can be maximized. It can release heat energy to the maximum. As a result, it becomes possible to lower the room temperature relatively.

  Further, in the general vehicle 100, after the roof 34, the window glasses 35, 36, 37, the interior trim 33, the seat 40, etc. absorb the solar radiation and the temperature rises, the thermal energy is radiated to the interior of the room. Has been released. When the occupant gets in the scorching sun, it radiates heat energy to the occupant, causing discomfort when getting on.

  On the other hand, in the thermal functional structure according to the embodiment, the temperature of members such as the roof 34, the window glasses 35, 36, and 37, the interior trim 33, and the seat 40, which have a particularly large effect on the occupant, is reduced. Also, the radiation of thermal energy to the occupants is reduced. As a result, it is also possible to reduce discomfort at the time of boarding.

  The boundary 51 is a vertical line 58 connecting the upper end 54 of the door panel and the lower end 55 of the side sill with a perpendicular 57 from the ground surface 56, in a length ratio upward from the lower end of the side sill 55 to the entire length of the vertical line 58. It is more preferable to set the position 58b between 20% and 60%.

  The position 58b of 20% to 60% is determined based on the position of the seat surface 40a which has a large effect on the room temperature. By setting the boundary line 51 at the position 58b, the vehicle body 50 can be moved. This is because the upper body portion 52 and the lower body portion 53, which have significantly different temperature distributions and heat flows, can be suitably divided into two parts so that the heat insulation function and the heat radiation function can be exhibited more efficiently. The position of the seat surface 40a differs depending on the vehicle type. As a typical example, in a general sedan type, it is installed at a position of about 50% in a length ratio upward from a side sill lower end 55 with respect to the entire length of a vertical line 58, and in a 1BOX type, 50%. % To 60%, and in the sports coupe type, at 20% to 30%. Therefore, in the present invention, the position of the boundary 51 is set to the position 58b of 20% to 60%. In this range, a temperature difference appears vertically on the indoor side, that is, on the interior side, and this temperature difference is a guide when selecting or judging an effective means for preventing heat intrusion and an effective means for promoting heat radiation. In addition, as for the position where the boundary line 51 is set, there is an optimum value as exemplified above for each vehicle type, but it is not limited to the set position for each vehicle type, and it can be appropriately changed. Not even.

  It is preferable that the means 61 having a heat insulating function includes at least one of heat insulating glass and / or heat ray reflective glass and heat insulating material.

  The window glass such as the windshield 35, the side glass 36, and the rear glass 37 has at least one function of heat ray absorption and heat ray reflection, thereby preventing heat from entering the room from the window glasses 35, 36, and 37 and increasing the temperature. This is because it can be reduced. Similarly, by including a heat insulating material, it is possible to prevent heat from entering the room from the upper part 52 of the vehicle body and reduce a rise in temperature.

  In a case where only one of the heat insulating glass and / or the heat ray reflective glass and the heat insulating material is used, a portion where the other is not to be provided is a heat intrusion path. For example, when only the heat insulating glass and / or the heat ray reflecting glass is used, the indoor temperature slightly decreases due to a decrease in the amount of heat input from the window glasses 35, 36, and 37. Conversely, the amount of heat input from 52 increases, and as a result, the decrease in room temperature decreases. Conversely, the same occurs when a heat insulating material is used for the upper part 52 of the vehicle body to which sunlight is applied and no countermeasures are taken for the window glasses 35, 36, and 37. Therefore, it is preferable that the means 61 having a heat insulating function include both a heat insulating glass and / or a heat ray reflecting glass, and a heat insulating material as a constituent material of the upper portion 52 of the vehicle body exposed to the sunshine. This is because the maximum effect on reducing the indoor temperature can be obtained, and the indoor temperature can be efficiently reduced. Here, the “upper body part 52 to which sunlight is applied” refers to a member installed in a room inside the outer panel 31. There is a constituent material as a material forming the upper body 52 of the solar radiation, and a heat insulating material is used as the constituent material.

  The heat insulating material refers to a material having a small thermal conductivity and a small thermal resistance value. Examples include foamed materials such as styrofoam and foamed polypropylene, and nonwoven fabrics made of felt and polyester. Further, it is also possible to form a heat insulating structure by using a reflecting material and a space. These materials and structures generally have a thermal conductivity of about 0.01 to 0.05 W / (m · k), a thickness of about 5 cm, and a thermal resistance of about 1 to 5 (m2 · k) / W. , Structure. Here, the thermal conductivity and the thermal resistance are values evaluated according to JIS A1412-1.

  In addition, “heat ray absorption” and “heat ray reflection” here are listed as functions of the window glasses 35, 36, and 37 in order to prevent energy from entering the room due to sunlight (solar radiation). The windshield 35 and the front side glass 36a are required by law to have a visible light transmittance (Tv) of the solar radiation component of 70% or more. As means for lowering the solar radiation transmittance (Te) within a range not hindering this, a function of heat ray absorption and / or heat ray reflection is used. Note that this is not the case for the rear side glass 36b and the rear glass 37.

  "Heat ray absorption" refers to a means of preventing other solar radiation components by absorption in the glass while satisfying legal restrictions, and "heat ray reflection" refers to a means of preventing other solar radiation components by reflection. .

  The values of solar reflectance (Re), solar transmittance (Te), visible light reflectance (Rv), and visible light transmittance (Tv) described in this specification are measured according to JIS R3106. is there.

  As a material for the window glasses 35, 36, and 37, generally used glass can be used. Of course, it may be transparent colorless or colored glass. For example, clear glass, green glass, bronze glass, gray glass, blue glass, UV-cut heat-insulating glass, heat-absorbing glass, tempered glass, and the like can also be employed in combinations that satisfy the above-described conditions.

  Of course, the glass itself can have a function of absorbing and reflecting heat rays, and may have other functions (antibacterial, deodorizing, etc.).

  It is preferable that the means 62 having a heat radiation function includes at least one of a high heat conductive material, a high radiation material, and ventilation.

  Examples of the high heat conductive material include metal, heat conductive ceramics, carbon fiber, graphite, and a resin composite containing them as a filler, and have a heat conductivity of, for example, 10 W / m / K or more. is there. When importance is placed on thermal conductivity, metals are preferred. The type of metal is not particularly limited, and is preferably a steel material from the viewpoint of low cost, and is preferably aluminum, magnesium, or an alloy thereof from the viewpoint of weight reduction and thermal conductivity. That is, it can be appropriately selected in consideration of cost and performance.

  The thermal conductivity of iron, aluminum, and magnesium is about 80 W / m / K, 237 W / m / K, and 156 W / m / K, respectively. For example, when a metal plate having a thickness of about 0.5 mm is laminated on a base resin having a thickness of 2 mm, the heat transfer performance may be about 40 to 120 times that of the base resin having a thickness of 2 mm alone. It is possible.

The material of the high thermal conductive material is preferably carbon fiber when weight saving and thermal conductivity are important. For example, the thermal conductivity of the carbon fiber in the fiber direction is 180 W / m / K in the normal grade and 1200 W / m / K in the high thermal conductivity grade. The specific gravity is about 2 g / cm ³ , about 80% of that of aluminum.

  Further, the material of the high heat conductive material is not limited to a single material, and a composite material containing metal or carbon fiber can be used. For example, a laminate of dissimilar metals such as iron and aluminum is preferred in that it can share the functions of thermal conductivity and rigidity, and a composite material in which carbon fibers are bonded with a resin can share the functions of weight reduction and rigidity. Is preferred. In addition, a heat pipe can be used as the high heat conductive material. As the working fluid used in the heat pipe, water, ammonia and the like can be used. However, in view of safety and operating temperature range, it is preferable to use water as the working fluid in the present invention.

Examples of the high-radiation material include paints, resin films, and the like, which contain a room-temperature far-infrared radiation filler. As the room-temperature far-infrared radiation filler, transition metal element oxide-based ceramics, natural ores, natural carbides, activated water, and the like are known. Examples of the transition metal oxide based ceramics include TiO ₂ , SiO ₂ , ZrO ₂ , Al ₂ O ₂ , MgO, BaSO ₄ , MnO ₂ , Fe ₂ O ₃ , ZrSiO ₂ , CoO, CuO, CrO ₃ , TiO, Fine particles of metal oxides such as TiN, ZrC, TiC and SnO ₂ and oxides of rare earth metals such as neodymium, lanthanum, yttrium, etc., and a small amount of silica, alkali metal oxides and alkaline earth metals An oxide, a Group 8 metal oxide, a phosphorus compound, or the like may be contained. As natural ores, mica, trimarin (an tourmaline), aurastone and the like are known. As natural carbides, those obtained by carbonizing seaweed into fine powder, charcoal represented by Bincho charcoal, carbon black, carbon fiber and the like are known.

  Such a room-temperature far-infrared radiation filler can efficiently emit far-infrared rays over a wide wavelength range of 4 to 20 μm or more.

  When kneading a room-temperature far-infrared radiating filler on the surface of paints and resin films, or when using it fixed on the surface, use one or several kinds of room-temperature far-infrared radiating filler to enhance far-infrared radiation performance. You may mix and use.

  The material used as the far-infrared radiation filler preferably has a far-infrared emissivity of 70% or more with respect to an ideal black body. More preferably, by setting it to 80% or more, it becomes possible to radiate very efficiently. As far-infrared radiation increases, the higher the temperature, the more radiation is emitted. In the case of textiles, it is better to use a material having a high radiation ability at a temperature near low temperature, that is, 30 to 40 ° C. Absent.

  The ventilation in the present invention includes both forced ventilation and natural ventilation. In addition to the effect of forced ventilation, when the indoor temperature is compared with the outside air temperature, the external temperature is sufficiently lower. In the present invention, the ventilation port is provided in the lower part 53 of the vehicle body. Since the nearby temperature does not rise above the room temperature, it is possible to sufficiently ventilate to the outside by natural ventilation.

  The upper part 52 of the vehicle body includes a roof 34, A, B, C, and D pillars, a windshield 35, a side glass 36, a rear glass 37, an upper part of the door structure 30 located above the boundary 51, and an upper part of the boundary 51. And at least one of the upper part of the rear hatch door located above the boundary line 51, and the means 61 having a heat insulating function may be installed in at least one of these parts. desirable.

  By installing the means 61 having a heat insulating function in these parts, it is possible to prevent heat input from a place where solar radiation is directly incident, or a place where solar radiation may be absorbed and emitted into a room.

  The upper part 52 of the vehicle body includes the roof 34, and the means 61 having a heat insulating function provided on the roof 34 is preferably made of a reflective heat insulating material.

  In addition, the upper portion 52 of the vehicle body includes A, B, C, and D pillars, an upper portion of the door structure 30 located above the boundary 51, an upper portion of the rear fender located above the boundary 51, and a boundary 51. Means 61 having at least one of the upper portions of the rear hatch doors located above the rear hatch door, and having a heat insulating function, are provided on the vehicle compartment R side of the outer panel 31 and / or the outer panel 31 constituting the vehicle exterior. It is preferable that the inner panel 32 is made of a reflective material installed on the outside of the vehicle. Here, as the means 61 having a heat insulating function provided on the upper part of the door structure 30, the upper part of the rear fender, or the upper part of the rear hatch door, it is preferable to further install a reflective heat insulating material on the vehicle exterior side of the interior trim 33. . In addition, these vehicle body upper portions 52 are used for a thermal functional structure for an automobile and form a vehicle body panel structure that forms a substantially vertical surface. The invention of the body panel structure to be made is being developed. Therefore, only one example is shown here, and a detailed description of the vehicle body panel structure will be described later.

  The upper part 52 of the vehicle body includes at least one of a windshield 35, a side glass 36, and a rear glass 37, and the means 61 having a heat insulating function provided thereon has at least one of a heat ray absorbing function and a heat ray reflecting function. It is preferable to be composed of a glass material having the following.

  This is because the above combination provides the best thermal insulation structure for the upper part 52 of the vehicle body.

  The structure of the reflective heat insulating material according to the present invention is such that the outer panel 31 has a reflective layer composed of a metal foil and / or a metal vapor-deposited film, and has a thermal insulation composed of a fiber aggregate and / or a foam layer on the indoor side. It is a laminate on which layers are formed. The reflective material prevents radiation from the outer panel 31 by reflection, and the laminated heat insulating material has a structure to prevent heat intrusion. As the reflecting material, in order to maintain the reflecting function, it is preferable to hold a thin plate having an infrared reflecting function on the surface of the material. The thin plate having the infrared reflection function is a metal foil, a metal-deposited film, each of them alone or in combination. It is desirable that the reflection material has an infrared reflectance of 70% or more as an ideal reflection material. In view of the availability of materials and ease of handling, a heat ray reflection film in which a layer having an infrared reflection function is metal-deposited Is particularly desirable.

  As the layer having an infrared reflecting function used in the present invention, aluminum foil, copper foil, aluminum oxide, a metal vapor-deposited film obtained by sputtering a copper oxide on the resin film surface, a transparent resin layer was adhered. Aluminum foil, copper foil to which a transparent resin layer is adhered, resin film to which aluminum is adhered, resin film to which reflective paint is applied, resin film in which a reflector and / or white pigment is mixed, aluminum oxide, copper oxide Can be used, but there is no particular limitation on the metal-deposited film obtained by sputtering on a non-woven fabric composed of polyester or polyester fiber.

  The vehicle body lower portion 53 is located on the floor, below the door structure 30 located below the boundary line 51, below the rear fender located below the boundary line 51, and below the boundary line 51. It is desirable to provide a means 62 having a heat dissipation function in at least one of these parts including at least one of the lower portions of the rear hatch door.

  The reason why the means 62 having a heat radiation function is installed in these parts is that the vicinity temperature is lower than the room temperature in order to radiate heat to the outside as described above. In general, in a vehicle body 50 for an automobile, the temperature in the vicinity of the vehicle body 50 becomes extremely high in a portion where sunlight is applied. For this reason, when a heat radiation mechanism is installed in a portion where the solar radiation is applied, since the nearby air flows backward or the heat energy of the nearby air flows backward from the heat radiation portion, the indoor heat energy is released outside the vehicle compartment R. This is because it becomes difficult.

  The lower body 53 is a lower portion of the door structure 30 located below the boundary 51, a lower portion of a rear fender located below the boundary 51, and a rear hatch door located below the boundary 51. Means having a heat radiation function provided at a lower portion of the door structure 30, a lower portion of the rear fender, and a lower portion of the rear hatch door include a paint having a high emissivity in the far-infrared region. In this case, it is preferable to use an infrared absorbing paint.

  The lower part 53 of the vehicle body includes a floor, and the means 62 having a heat radiation function provided on the floor is preferably made of a heat radiation carpet using a good heat conductive material.

  The vehicle body lower part 53 includes a floor, and the means 62 having a heat radiation function provided on the floor is used to transfer heat between the heat sink provided on the floor and the heat sink from above the instrument panel 38 and / or the rear parcel shelf 39. And a heat pipe for performing heat radiation. A good heat conductor may be used instead of the heat pipe.

  These means 62 having a heat radiation function may be used alone or in combination, and a sufficient effect can be exerted in any use form.

  One or more means selected from the above-mentioned means 61 having the heat insulating function are provided on the upper body 52, and one or more means selected from the above-mentioned means 62 having the heat dissipation function are provided on the lower body 53. Is preferred.

With this configuration, it is possible to prevent heat input due to solar radiation from the outside of the vehicle and to release the maximum amount of heat energy in the room. while reducing discomfort during boarding of, not only the comfort of occupants of the habitability for excellent car insulation effect, it is possible to reduce the cooling load, the reduction of fuel consumption, greatly to a reduction of CO ₂ It will contribute.

  According to the thermal functional structure for an automobile of the present invention, the vehicle body 50 for forming the compartment R is divided into a vehicle body upper portion 52 and a vehicle body lower portion 53 with a substantially horizontal boundary 51 as a boundary. Means 61 having a heat-insulating function are provided in the upper body part 52, while means 62 having a heat-dissipating function are provided in the lower body part 53. By reducing the radiation from the interior trim of the vehicle and promoting the radiation of heat from the location where the temperature difference is greatest between the outside atmosphere and the outside of the cabin R, the air temperature of the indoor upper space and the air of the indoor lower space are reduced. It is possible to reduce the temperature difference between the temperature and the temperature of the room, thereby lowering the air temperature in the entire room.

  Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples.

(Example 1)
Referring to FIG. 5, means 61 having a heat insulating function is provided in upper part 52 of the vehicle body above boundary line 51, while means 62 having a heat radiation function is provided in a lower part 53 of the vehicle body below boundary line 51.

In the vehicle 100 of the first embodiment, a reflective heat insulating material 64 is provided above the head lining 63. The reflective heat insulating material 64 uses a fiber heat insulating material (manufactured by Sumitomo 3M Ltd., trade name: Thinsulate, surface density 400 g / m ² ) as a heat insulating layer, and a metal-deposited resin film (manufactured by Unitika Ltd.) Product name: embrene, model number: MP-25) was adhered as a reflective layer. The spatial distance between the reflective layer and the outer panel 31 was 10 mm.

  As the windshield 35, the side glass 36, and the rear glass 37, laminated glass (cool veil manufactured by Asahi Glass Co., Ltd.) in which a heat ray absorbing film was used as an intermediate film and Tv was 78% and Te was 43% was used.

As shown in FIG. 6, a reflection member 65 was provided above the door structure 30. The reflector 65 was also provided inside the A, B, and C pillars. In the upper part of the door structure 30, the reflective material 65 is provided on both the vehicle room R side of the outer panel 31 and the vehicle outer side of the inner panel 32, so that multiple reflection occurs. As the reflective material 65, the above-mentioned resin film on which metal was vapor-deposited (product name: Embrene, model number: MP-25, manufactured by Unitika Ltd.) was used. Further, a heat insulating material 66 is further provided outside the door trim, which is the interior trim 33, on the vehicle. As the heat insulating material 66, a fiber heat insulating material (manufactured by Sumitomo 3M Limited, trade name: Thinsulate, area density 400 g / m ² ) was used. On the other hand, an electrodeposition paint mixed with carbon black was applied to the lower part of the door structure 30 as the infrared absorbing paint 67 as the means 62 having a heat radiation function. The above-mentioned structure was applied to all doors to obtain a heat functional structure.

(Example 2)
FIG. 7 is a diagram provided for explanation of a second embodiment of the present invention.

  The second embodiment is different from the first embodiment in that the means 62 having a heat radiation function is modified. The means 62 having a heat radiation function according to the second embodiment is provided with a mesh structure 68 below the interior trim 33, and is modified so as to allow ventilation from the interior side to the outside of the vehicle. Other structures are the same as those of the first embodiment.

(Example 3)
FIG. 8 is a diagram provided for explaining a third embodiment of the present invention.

  In the third embodiment, the means 62 having a heat radiation function is modified from the first embodiment. The means 62 having a heat dissipation function of the third embodiment is obtained by replacing the floor carpet provided on the floor 69 with a heat dissipation carpet 70. As the structure of the heat-radiating carpet 70, the raised layer is a tufted skin using high-transmissivity non-colored polyester fiber (diameter 70 μm), and the base fabric layer is polyester fiber (diameter 40 μm) kneaded with 2% by weight of carbon black. A non-woven fabric (having a basis weight of 600 g / m2 and a thickness of 5 mm) was prepared from the above and laminated.

(Example 4)
FIG. 9 is a diagram provided for explanation of a fourth embodiment of the present invention.

  In the fourth embodiment, the means 62 having a heat radiation function is modified from the first embodiment. The means 62 having a heat radiation function according to the fourth embodiment includes a heat pipe 72 connected to one end of the heat collecting plate 71 by inserting a heat collecting plate 71 made of a metal plate into the instrument panel 38 resin molded body and the rear parcel shelf 39. A configuration was adopted in which the other end was connected to a heat sink 73 installed in the lower part 53 of the vehicle body. The means 61 having a heat insulating function has the same structure as that of the first embodiment.

(Comparative Example 1)
Unlike the structures of Examples 1 to 4, a normal vehicle was prepared in which neither the means 61 having a heat insulating function nor the means 62 having a heat radiating function was provided.

(Comparative Example 2)
A vehicle was prepared in which only the means 61 having the heat insulation function in Example 1 was provided on the upper part 52 of the vehicle body.

(Comparative Example 3)
A vehicle was prepared in which only the means 62 having the heat radiation function in Example 1 was provided in the lower part 53 of the vehicle body.

(Comparative Example 4)
The position of the boundary line 51 is shifted upward, and only the roof 34, the pillars, and the window glasses 35, 36, and 37 in the first embodiment are provided with the vehicle body upper portion 52 provided with the means 61 having a heat insulating function. Further, a vehicle was prepared as a means 62 having a heat radiation function by applying an infrared absorbing paint to the entire surface inside the door.

(Comparison method)
After leaving it for 3 hours from 10:00 am under the outside air condition of 35 ° C., a comparison experiment of the air temperature in the center of the room and the surface temperature of the headlining 63 was performed. FIG. 10 shows the temperature measurement results.

  As shown in FIG. 10, regarding the surface temperature of the head lining 63, it was found that the temperatures of Examples 1, 2, 3, and 4 were much lower than those of Comparative Examples 1, 2, 3, and 4. Further, with respect to the air temperature at the center of the room, it was found that the temperatures of Examples 1, 2, 3, and 4 were sufficiently lower than those of Comparative Examples 1, 2, 3, and 4. That is, since both the heat insulation function and the heat radiation function are compatible, the indoor temperature can be reduced, and further, the effect is obtained only by using the respective means 61 and 62 with the boundary 51 defined by the present invention as a boundary. Was exhibited, and it was found that the room temperature could be sufficiently reduced.

(2. Body panel structure used for thermal functional structure for automobiles)
Next, an outer panel 31 which is used for the above-described thermal functional structure for an automobile and has a substantially vertical surface and constitutes the outer appearance of the vehicle 100, and an inner panel 32 facing the outer panel 31 and A vehicle body panel structure including the interior trim 33 will be described. It is assumed that the vehicle body panel structure according to the present invention is used for the above-described thermal functional structure for an automobile. For this reason, even a vehicle body panel provided with no heat radiating means is included in the concept of the vehicle body panel structure according to the present invention. However, in this case, it is necessary to provide the means 62 having a heat radiation function in the lower part 53 of the vehicle body other than the vehicle body panel based on the measurement result of the comparative example 2 described above. For example, the means 62 having a heat radiation function provided on the floor 69 may be constituted by a heat radiation carpet 70 using a good heat conductive material. The following description focuses on the vehicle body panel structure only.

  First, the operation of the vehicle body panel structure of the present invention will be described.

  When the amount of heat received in a panel of the vehicle 100 that is left standing under the scorching sun, especially in a vertical panel, is not uniform. Obviously, the amount of heat is larger at a portion at an angle close to a right angle to the direction of sunlight, that is, at the upper portion. That is, the heat transfer from the outer panel 31 to the cabin R mainly occurs at the upper part of the outer panel 31 where the solar radiation is applied. The form of this heat transfer is radiation from the outer panel 31 to the passenger compartment R and heat transfer via air therebetween. Due to this heat transfer, the room temperature becomes higher than the temperature outside the vehicle. More specifically, the space and the interior surface in the upper part of the room are hotter than the space and the interior surface in the lower part. As a result, heat is transmitted from top to bottom in the room. Since the temperature in the lower part of the room is relatively higher than that in the outside of the vehicle, the heat is radiated from the lower part of the room to the outside of the vehicle. However, heat dissipation is slight at present, and is insufficient to improve the indoor thermal environment.

  How the thermal environment in the room is improved by the present invention will be described with reference to FIG. 11, which schematically shows a cross section of a vehicle body panel structure.

  In the vehicle body panel structure of the present invention, first, attention is focused on the outer panel 31 to which the solar radiation C is applied and the upper portion A where the interior material on the side of the cabin R is located. Features.

  Due to such heat insulation treatment, heat radiation from the portion A to the outside of the vehicle is unlikely to occur, so that other portions relatively easily radiate heat. Although the lower part is also exposed to solar radiation, it is weaker than the upper part, and as described above, the inner lower part is also hotter than the outside of the vehicle, so that the lower part acts as a part B for heat radiation. Heat insulation D reduces heat intrusion D into the room and suppresses temperature rise in the room, especially in the upper part A.

  At this time, the heat received by the surface of the outer panel 31 due to the heat insulation treatment is partially reflected or radiated and goes out of the vehicle, but most of the heat is applied to the outer panel 31 and parts such as the interior, and between the panel and the interior. It is trapped in the air, especially in the upper part of the part itself or in the upper part. The heat that has entered the room through the upper part A raises the temperature of the upper part of the passenger compartment R and makes it higher than the temperature of the lower part of the passenger compartment R. Similarly, the heat stored in the air between the component itself and the panel and the interior, particularly the air present in the upper part and the upper part of the part itself, also raises the temperature of the upper part of the part and makes it higher than the temperature of the lower part of the part.

  Since such a temperature difference is generated, heat transfer E from the upper part to the lower part of the vehicle compartment R and heat transfer F from the upper part to the lower part of the vehicle compartment R occur. Both of these escape from the lower part of the outer panel 31 to the outside of the vehicle (radiation G). By not performing heat insulation processing on the lower part of the outer panel 31 and the interior material on the side of the vehicle cabin R, heat radiation from the room to the outside of the vehicle is easily caused. Further, it is also possible to devise to promote heat radiation in the lower portion.

  The heat transfer from the outside to the room can be roughly classified into two forms, radiation and heat transfer / heat conduction, and there is a corresponding heat insulation method. By reducing the amount of heat transfer by adiabatic treatment, it is possible to suppress a significant rise in the indoor air temperature. The radiation depends on the surface temperature and emissivity of the outer panel 31 and the surface between the opposite surfaces such as the back surface of the interior. The lower the emissivity, the lower the radiant heat transfer. On the other hand, in order to reduce the heat transfer / heat conduction, the heat conductivity may be reduced. Thereby, the amount of heat transfer when the temperature difference is the same is reduced.

  As a method of promoting heat radiation, any of a method of promoting heat transfer from the room to the outer panel 31, a method of promoting radiant heat transfer from the back surface of the interior to the back surface of the outer panel 31, and a method of promoting heat conduction of the interior itself And these may be used in combination.

  In the prior art, the only consideration is to suppress the intrusion of heat into the room. I have. In the present invention, by simultaneously performing heat insulation and heat radiation, the thermal environment in the room does not extremely deteriorate even when the car is left under the scorching sun.

  In addition, the present invention is characterized in that thermal energy stored in components such as the outer panel 31 and the interior, and thermal energy stored in air existing between the two, which have not been considered so far, are released to the outside of the vehicle. Is also an effective technique. When the air-conditioner mounted on the vehicle is operated to reduce the indoor air temperature and the surface temperature of the interior parts, the accumulated heat energy causes a heat difference between the inside of the parts and the heat entering the room. This leads to undesirable effects on room comfort.

  In the present invention, the load on the air conditioner can be reduced by radiating the heat energy stored in the components such as the outer panel 31 and the interior and the heat energy stored in the air existing between the two to the outside of the vehicle. be able to.

  The lowering of the emissivity has been described as a method of insulating the upper surface of the back surface of the outer panel 31 and the surface of the vehicle cabin R facing the outer panel 31. The effect will be described as follows. That is, by lowering the emissivity of the back surface of the outer panel 31, the amount of radiant heat transfer on the back surface of the outer panel 31 is reduced. The lower the emissivity, the lower the radiant heat transfer. That is, heat insulation is possible. By reducing the emissivity of the surface of the vehicle cabin R facing the outer panel 31, it becomes difficult to absorb the radiation from the back surface of the outer panel 31. That is, it is thermally insulated.

  The emissivity described in the present invention is that of a wavelength in the range of 3 μm to 30 μm. The wavelength in the same range is the main range of light emitted from the vehicle 100 in which the outer panel 31 of the vehicle and the surface facing the outer panel 31 are left under the scorching sun. As a measurement method, for example, a method based on the standard of ASTM C1371-98 can be used.

  Next, an embodiment of the present invention will be described.

  The outer panel 31 described in the present invention is a vehicle body structural member. The back surface of the outer panel 31 in the present invention means a surface opposite to a surface constituting the appearance of the vehicle 100. In the present invention, it is essential that there be a surface facing the back surface, and the facing surface is desirably an element constituting the vehicle compartment R or a portion serving as a boundary. More specifically, the interior trim 33 and / or the inner panel 32.

  The indoor trim 33 is, for example, a door trim, a door inner panel, a head lining, a pillar garnish, a door moisture-proof sheet, and the like. Here, the opposing positions are positions facing each other with a gap including air at least partially. The material of the interior trim 33 includes at least one selected from the group consisting of polyethylene terephthalate, polypropylene, polyethylene, acrylic paper, and styrene paper. In addition, commonly used materials such as a phenol resin, a polyphenylene oxide resin, and a wood board can be included. The inner panel 32 is at least one type selected from the group consisting of a steel plate and a rustproof coating.

  The outer panel 31 is at least one type selected from the group consisting of a steel plate and a rustproof coating. The outer panel 31 described here includes at least one of a door panel, a pillar, a fender, a roof 34, a body side, and a trunk lid panel. Of particular interest are vertical outer panels 31, such as door panels, pillars, fenders, body sides, and the like.

  The vehicle body panel structure according to the present invention is characterized in that at least one of the outer panel 31 and at least one of the inner panel 32 and the interior trim 33 facing the outer panel 31 is partially insulated. The position where the heat insulation process is performed, that is, the position where the heat insulation means is provided, is determined by dividing the vehicle body 50 for forming the compartment R into a vehicle body upper portion 52 and a vehicle body lower portion 53 with a substantially horizontal boundary 51 as a boundary. The upper part 52. The concepts of the upper body portion 52, the lower body portion 53, and the boundary 51 are the same as those described for the thermal functional structure for an automobile.

  As one of the heat insulating embodiments of the present invention, a film having a low emissivity surface on at least one side is provided on the back surface of the outer panel 31 and a part of the surface of the vehicle cabin R facing the outer panel 31 so that the film has a low emissivity. A form in which the emissivity surface is attached so as to face the opposing surface can be given.

  The part to be stuck is preferably the upper part of the outer panel 31 and the interior trim 33 opposed thereto. Film to be pasted is aluminum foil, copper foil, aluminum foil whose surface is protected by a transparent resin layer, copper foil whose surface is protected by a transparent resin layer, resin film with aluminum adhered, resin film coated with reflective paint , A resin film mixed with a reflective material and / or a white pigment.

  When the film to be attached is an aluminum foil, a copper foil, an aluminum foil whose surface is protected by a transparent resin layer, or a copper foil whose surface is protected by a transparent resin layer, the thickness is preferably 1 μm to 1000 μm, particularly preferably 5 μm to 50 μm. is there. When the thickness is less than 1 μm, the strength is low and the sheet is easily broken during handling. On the other hand, if it exceeds 1000 μm, the flexibility is impaired, and the sticking workability is reduced.

  The type of the resin film to which aluminum is adhered, the resin film to which the reflective paint is applied, the resin film in which the reflective material and / or the white pigment are mixed is not particularly limited, but polyester and polyethylene are considered in consideration of heat resistance and flexibility. And the like are preferred. The thickness of the resin film is preferably 5 μm to 100 μm for handling. It is desirable that the thickness of the aluminum to be deposited is in the range of 5 nm to 100 μm. If the thickness is less than 5 nm, the reflection effect is not sufficient, and if it exceeds 100 μm, the cost increases. As a method for attaching aluminum, vapor deposition is preferable. As the reflective paint, a paint containing aluminum scale as a main component can be used. The thickness of the coating is preferably from 10 nm to 100 μm, similarly to aluminum adhered to the resin. If the thickness is less than 10 nm, the reflection effect is not sufficient, and if it exceeds 100 μm, the film is easily broken. The content of the reflector and the white pigment mixed into the resin is 0.001 to 2% by weight. If the content is 0.001% by weight or less, the transmittance is high, and even if 2% by weight or more is mixed, the moldability as a film is difficult.

  The film is attached using an adhesive. As the adhesive, an epoxy-based adhesive, a urethane-based adhesive, a hot-melt adhesive, or the like can be used, and an epoxy-based adhesive can be mentioned as a particularly suitable adhesive. The epoxy adhesive of the present invention contains an epoxy resin, a curing agent, and a high thermal conductivity material as main components. The epoxy resin is not particularly limited as long as it is usually used as an epoxy adhesive. For example, a bisphenol A type epoxy resin obtained from bisphenol A and epichlorohydrin can be mentioned. The curing agent is not particularly limited as long as it is generally used for an epoxy adhesive. For example, primary, secondary and trialiphatic polyamines, polyamides, aromatic polyamines, acid anhydrides, diamides, phenolic resins, silicones and the like can be mentioned. An appropriate amount of the curing agent is selected according to the types of the epoxy resin and the curing agent.

  As another embodiment of the heat insulation according to the present invention, a form in which a coating material whose applied surface can have a low emissivity is attached to the site can be cited.

  The thickness of the low-emission coating is preferably 1 to 100 μm, and more preferably 10 to 50 μm. When the thickness of the coating is less than 1 μm, low activation is insufficient, and when it exceeds 100 μm, problems such as peeling of the coating may occur. Paints that can have low emissivity include reflectors. The reflective material is mainly composed of aluminum scales. The reflecting material desirably accounts for 3 to 90% by mass of the entire paint. If the content is 3% by mass or less, the content effect is not exhibited, and if the content is 90% by mass or more, sufficient adhesion cannot be ensured.

  Examples of the vehicle used for dispersing the reflector and / or the white pigment include conventionally known acrylic resins, epoxy resins, polyamide resins, polyurethane resins, polyester resins, polybutadiene resins, and modified products of these resins. No. A known method such as spraying or dipping can be used as a coating method. The thickness of the coating film is preferably from 1 to 100 µm, more preferably from 10 to 50 µm. If the thickness of the coating film is less than 1 μm, the function of reducing radiation becomes insufficient, and if it exceeds 100 μm, problems such as peeling of the coating film may occur.

  As still another embodiment of the present invention for heat insulation, there is a form in which a sheet-like heat insulating material is attached to the above-mentioned portion.

  The sheet-shaped heat insulating material is selected from the group consisting of a foamed resin sheet, a nonwoven fabric, and a woven fabric. As the foamed resin sheet, for example, a foamed sheet made of polypropylene, polyethylene, polystyrene, or polyurethane and preferably foamed to 5 to 40 times its original size, such as Slim Ace manufactured by Furukawa Electric Co., Ltd., can be given. Examples of the nonwoven fabric include Thinsulate manufactured by Sumitomo 3M Limited.

  The boundary between the part providing the heat insulation function and the part providing the heat radiation function is an upper and lower centering on a boundary 51 formed by connecting a point at which the angle between the tangent of the surface of the outer panel 31 and the ground is 90 °. It is preferably within a width of 15 cm. The above-mentioned ground refers to a state where the car does not tilt on flat ground. Above the point where the angle between the ground and the tangent to the surface of the outer panel 31 is 90 °, sunlight is more likely to be received, and below that point, it is in a position facing the ground, which is suitable as a heat-dissipating part. The reason why the height is set to 15 cm above and below the boundary is to take into account the ease of heat insulation treatment, the situation where the car is placed, and the shape of the car. If the height is higher than 15 cm above the boundary, heat penetration due to solar radiation is large and heat dissipation cannot catch up. Conversely, if the distance is less than 15 cm at the boundary, heat penetration due to solar radiation can be sufficiently prevented, but heat radiation becomes difficult. When there are a plurality of the boundary lines 51, it is desirable to use the boundary line 51 closest to the ground as a reference line for providing the heat insulation function and the heat radiation function. This is because it is important to suppress heat intrusion first.

  Embodiments that provide the above-described heat insulating function are shown in FIGS. 12 to 14 using schematic views of a cross section of a door structure including an outer panel 1, an inner panel 2, and a door trim 3. FIG. In addition, the code | symbol "4" in a figure has shown the side glass glass.

  As described above, at least one of the back surface of the outer panel 1, the both surfaces of the inner panel 2, and the surface of the door trim 3 facing the outer panel 1 is provided with a heat insulating means for heat insulation. Insulated.

  FIG. 12A shows an embodiment in which a high-reflectance material 5 is provided on the upper portion of the back surface of the outer panel 1 and partially subjected to heat insulation processing.

  FIG. 12B shows an embodiment in which a high-reflectance material 5 is applied to an upper portion of a surface (front surface) of the inner panel 2 facing the outer panel 1 and partially heat-insulated.

  FIG. 12C shows an embodiment in which a high-reflectance material 5 is provided on the upper portion of the back surface of the inner panel 2 and partially heat-insulated.

  FIG. 12D shows an embodiment in which the high reflectance material 5 is provided on the upper surface of the surface (back surface) of the door trim 3 facing the outer panel 1, and the heat insulation treatment is partially performed.

  Further, FIG. 13 (A) shows an embodiment in which a high reflectivity material 5 is applied to each of the upper part of the back surface of the outer panel 1 and the upper part of the surface of the inner panel 2, and partially heat-insulated.

  FIG. 13B shows an embodiment in which a high-reflectance material 5 is applied to each of the upper portion of the back surface of the outer panel 1 and the upper portion of the back surface of the door trim 3, and partially heat-insulated.

  FIG. 13 (C) shows an embodiment in which a high reflectivity material 5 is applied to each of the upper portion of the back surface of the outer panel 1, the upper portion of the front surface of the inner panel 2, and the upper portion of the back surface of the door trim 3, and partially heat-insulated. .

  The type of thermal insulation used is not limited to one type, and a plurality of types of thermal insulation may be used in combination. This embodiment is shown in FIGS.

  FIG. 14A shows an embodiment in which a sheet-like heat insulating material 6 is attached to the upper portion of the back surface of the outer panel 1, the high-reflectance material 5 is applied to the upper portion of the surface of the inner panel 2, and the heat insulating process is partially performed. It is.

  FIG. 14B shows an embodiment in which the sheet-like heat insulating material 6 is attached to the upper portion of the back surface of the outer panel 1 and then the high-reflectance material 5 is applied to partially heat-insulate it.

  In the above embodiment, the boundary between the part providing the heat insulation function and the part providing the heat radiation function is formed by connecting the point at which the angle between the tangent 7 on the surface of the outer panel 1 and the ground becomes 90 °. 8, a space above the horizontal line 9 including the boundary line 8 is defined as a heat insulating side 10 for heat intrusion, and a space below the horizontal line 9 is defined as a heat radiation side 11. However, the boundary between the part providing the heat insulation function and the part providing the heat radiation function may be within a width of 15 cm above and below the boundary 8.

  FIG. 15 shows that the high-reflectivity material 5 is used as a heat insulating means for the outer panel 1 up to 10 cm below a boundary line 8 formed by connecting a point between the tangent 7 on the surface of the outer panel 1 and the ground at 90 °. Is shown on the back surface of FIG. Although heat radiation occurs in the lower part where the heat insulation treatment is not performed, a treatment for promoting this heat radiation may be performed.

  As one of the embodiments of the present invention that promotes heat radiation, as shown in FIG. 16A, a vent 12 can be provided below the trim 3. In this embodiment, heat transfer is promoted by integrally connecting the heat flows in the sectional direction of the outer panel 1 from the interior air to the trim surface, the trim interior, and the trim interior from the interior. The position of the ventilation hole 12 is desirably a position adjacent to the lower part where the heat transfer E from the top to the bottom of the room described with reference to FIG. 11 reaches. The role of the ventilation holes 12 is to facilitate the contact of the air in the lower part of the room from the trim 3 with the outer panel 1 or the inner panel 2 to promote heat radiation, and the shape, size and number of the trims 3 It suffices to satisfy other requirements such as safety and security. Further, the ventilation holes 12 may be provided in the inner panel 2 other than the trim 3. This is because heat transfer can be promoted.

  As another embodiment of the present invention that promotes heat radiation, as shown in FIG. 16B, a surface coated on the lower surface of at least one of the back surface of the outer panel 1 and the surface of the trim 3 facing the outer panel 1. A form in which a paint having an emissivity in the far infrared region of 0.7 or more is attached. By increasing the emissivity, heat radiation by radiation can be promoted. If it is 0.7 or less, sufficient radiant heat transfer cannot be expected. The paint applied by coating having an emissivity in the far infrared region of 0.7 or more is made of at least one selected from the group consisting of zirconium oxide, alumina, zircon, titania, aluminum titanate, cordierite, and aluminum silicate. High emissivity material 13 is included. It is desirable that the high emissivity material 13 occupies 0.3 to 10% by mass of the whole paint. If the content is less than 0.3% by mass, the content effect is not exhibited, and if the content is more than 10% by mass, sufficient adhesion cannot be ensured. Examples of vehicles used for dispersing the high emissivity material 13 include conventionally known acrylic resins, epoxy resins, polyamide resins, polyurethane resins, polyester resins, polybutadiene resins, and modified products of these resins. . A known method such as spraying or dipping can be used as a coating method. The thickness of the coating film is preferably from 1 to 100 µm, more preferably from 10 to 50 µm. If the thickness of the coating film is less than 1 μm, the function of reducing radiation becomes insufficient, and if it exceeds 100 μm, problems such as peeling of the coating film may occur.

  As still another embodiment of the present invention that promotes heat radiation, as shown in FIG. 16C, a form in which a good thermal conductivity material 14 is included in the trim 3 can be cited. The heat conductivity of the trim 3 itself is increased to promote the heat transfer inside the trim among the heat flow from the room air to the surface of the trim, the inside of the trim, and the cross section from the inside of the trim to the outer panel 1. The trim 3 itself includes, as described above, commonly used materials such as polyethylene terephthalate, polypropylene, polyethylene, acrylic paper, styrene paper, phenolic resin, polyphenylene oxide resin, and wood board. It is as low as 0.5 W / m / K or less at most. Here, the term "good heat conductor" refers to a material having a thermal conductivity of 10 W / m / K or more, and is generally a metal, high heat conductive ceramics, carbon fiber, graphite, or a resin composite containing them as a filler. The body is a good heat conductive material. It is desirable to include the good thermal conductivity material 14 in the form of a sheet or a net and insert it into the trim 3 by insert molding. The size of the good thermal conductivity material 14 desirably covers at least the heat radiating portion of the trim, and more desirably extends to the heat insulating portion. This is because the heat passing through the heat-insulating portion can be transferred to a lower-temperature portion by heat conduction before reaching the room through the trim.

  In order to obtain a more desirable effect, one end of the good conductor may be directly fastened to the outer panel 1, the inner panel 2, or a metal part for fastening them. As a method for joining the good heat conductor to the vehicle body panel, ordinary screwing, fastening with bolts / nuts, welding or bonding can be used. Thereby, heat conduction in a direction other than the above-described cross-sectional direction can be further promoted. When the fastening method is selected, in view of the purpose of the present invention, which aims at thermal conduction, the area of the fastening portion should be as large as possible, or the heat conduction for filling the voids of the fastening portion to secure the heat conductivity. It does not hinder means such as auxiliary use of a conductive sealing material or paste.

  By insulating the upper surface of at least one of the back surface of the outer panel 1, both surfaces of the inner panel 2, and the surface of the interior 3 facing the outer panel 1, the amount of heat transferred from the outer panel 1 to the vehicle compartment R Can be reduced. As a result, it is possible to suppress an increase in the temperature of the passenger compartment R. Further, by not providing the above-mentioned heat insulation treatment or providing a portion capable of positively promoting heat radiation at the lower portion, heat radiation from room air to the outside of the vehicle via the room trim 3 and the outer panel 1 is promoted. You. At the same time, the heat held by the indoor trim 3, the outer panel 1, and the air held between the two is promoted to the outside of the vehicle. As a result, it is possible to provide the vehicle 100 that can promote indoor temperature comfort.

  Next, embodiments of the present invention will be described. However, it goes without saying that the present invention is not limited to only such embodiments.

(Common parts of the embodiment)
The following evaluation device was created that imitated the outer panel 1 and the interior space. FIG. 17 shows a schematic diagram.

  An insulation box 15 having a space of 30 cm long × 30 cm wide × 50 cm deep was prepared so as to have an outer shape of 50 cm long × 50 cm wide × 60 cm deep and a thickness of 10 cm. The internal space 16 of the heat insulating box 15 simulates the interior space of the cabin R of the car.

  A panel 17 made of a 1 mm thick polypropylene (PP) resin plate simulating a trim 3 with a length of 50 cm and a width of 50 cm so as to cover the opening (length 30 cm × width 30 cm) of the heat insulation box 15 without any gap. : 0.5 W / m · K). On the panel 17, a spacer heat insulating material 18 having an outer shape of 50 cm in length × 50 cm in width × 10 cm in depth, having a thickness of 10 cm, and having a hollow of 30 cm in length × 30 cm in width × 10 cm in depth was placed. Thus, a space corresponding to the space between the interior and the outer panel 1 was provided in the test apparatus.

  On the spacer heat insulating material 18, a panel 19 having a length of 50 cm x a width of 50 cm and a thickness of 0.8 mm simulating the outer panel 1 was placed so as to cover the opening (length 30 cm x width 30 cm) without gaps. On the panel 19, a spacer heat insulating material 20 having an outer shape of 50 cm in length × 50 cm in width × 10 cm in depth, a thickness of 10 cm, and having a hollow of 30 cm in length × 30 cm in width × 10 cm in depth was placed.

  Panel 19 was adjusted as follows. A 35 cm × 35 cm × 0.8 mm thick iron test piece, which had been subjected to degreasing, washing and chemical conversion treatments, was immersed and painted in Power Top V6 (Nippon Paint Co., Ltd., gray electrodeposition paint), washed with water and baked at 150 ° C. The dry film thickness of the electrodeposition coating film (front and back of the primer layer) was 20 μm.

  Next, one surface of the coating film is spray-coated with Olga P-28101 (manufactured by Nippon Paint Co., intermediate coating), and further sprayed with Olga P-2-1 202B (manufactured by Nippon Paint Co., top coating). Then, simultaneous baking was performed at 150 ° C. to form a multilayer coating film. This test piece was used as a panel 19 corresponding to the outer panel 1. Panel 19 was placed with the side on which the multilayer coating was formed facing outward. The dry film thickness of both the intermediate coating film and the top coating film was 40 μm.

  In each of the following embodiments, the panels 17 and 19 are subjected to a heat insulation treatment and, if necessary, a heat radiation treatment.

  FIG. 18 shows a list of heat-insulating parts and heat-insulating methods in the examples and comparative examples, and FIG. 19 shows a list of heat-dissipating parts and heat-dissipating methods in the examples and comparative examples.

(Example 1)
In Example 1, the upper half (15 cm × 30 cm) of the surface of the panel 17 facing the panel 19 was used as the heat insulating portion. A 12 μm-thick PET film (manufactured by Unitika Ltd., product name: Emblet, model number: MP12) having one side subjected to Al vapor deposition was attached to this heat-insulated portion with an epoxy resin adhesive to obtain a heat-insulating method. . The emissivity of the attached film is 0.05.

  The lower half (length 15 cm × width 30 cm) of the surface of the panel 17 facing the panel 19 was used as a heat-radiating portion. The heat-dissipating method was that no heat-insulating treatment was applied to this heat-dissipating portion. That is, in the first embodiment, the heat dissipation method is such that a PET film having a thickness of 12 μm on which one side is subjected to Al vapor deposition is not attached to the lower half.

  In the following Examples 2 to 12, the heat insulation treatment is performed only partially (the upper half of the panel 17 and / or the panel 19), and the heat radiation part (the lower half of the panel 17) is not subjected to the heat insulation treatment. This was the heat dissipation method.

(Example 2)
In Example 2, a 5 μm-thick Al foil was used instead of the 12 μm-thick PET film having the Al-deposited surface of Example 1. The emissivity of the attached Al foil is 0.05. The procedure was the same as in Example 1 except that the Al foil was attached.

(Example 3)
In Example 3, 10 parts by weight of an aluminum pigment (Toyo Aluminum Co., Ltd., leafing aluminum paste) and an oil-free polyester resin varnish (Dainippon Ink Co., Ltd.) were used in place of the 12 μm-thick PET film having an Al-deposited surface of Example 1. 5 parts by weight of a chemical industry, solid content 60%) and 1 part by weight of a polyisocyanate resin (Nippon Polyurethane Industry Co., Ltd., solid content 70%) are mixed and dispersed, and the viscosity is adjusted by further diluting with a solvent. And a 25 μm thick PET film (product name: Emblet, model number: S25) having a thickness of 25 μm spray-coated so as to have a uniform dry film thickness of 20 μm. The emissivity of this coating film is 0.10, and the thickness of the adhesive layer is 15 μm. The procedure was the same as in Example 1 except that the Al-containing paint-coated film was attached.

(Example 4)
In Example 4, 10 parts by weight of an aluminum pigment (leafing aluminum paste, manufactured by Toyo Aluminum Co., Ltd.) and an oil-free polyester resin varnish were used instead of attaching the PET film having a thickness of 12 μm having an Al-deposited surface of Example 1 to the film. 5 parts by weight (manufactured by Dainippon Ink and Chemicals, Inc., solid content 60%) and 1 part by weight of a polyisocyanate resin (manufactured by Nippon Polyurethane Industry Co., Ltd., solid content 70%) are mixed and dispersed, and further diluted with a solvent. The viscosity-adjusted one was spray-coated uniformly so as to have a dry film thickness of 20 μm. The emissivity of this coating film is 0.10, and the thickness of the adhesive layer is 15 μm. The procedure was the same as in Example 1 except that the Al-containing paint was applied.

(Example 5)
In Example 5, the upper half (15 cm × 30 cm) of the surface of the panel 19 facing the panel 17 was used as the heat insulating part. As in Example 1, a 12-μm-thick PET film having an Al vapor-deposited surface was attached to this heat-insulating portion with an epoxy resin adhesive.

(Example 6)
In the sixth embodiment, the upper half (15 cm × 30 cm) of the surface of the panel 17 facing the panel 19 and the upper half (15 cm × 30 cm) of the panel 19 facing the panel 17 are used. Both were heat insulating parts. As in Example 1, a 12-μm-thick PET film (product name: emblet, model number: MP12, manufactured by Unitika Ltd.) having one side subjected to Al vapor deposition was applied to these heat-insulating portions in the same manner as in Example 1. Pasted in. The procedure was the same as in Example 1 except that the PET film was also attached to the upper half of the panel 19.

(Example 7)
In Example 7, 70% (length 21 cm × width 30 cm) from the top of the entire surface of the panel 17 was used as the heat insulating portion. A 12-μm-thick PET film (product name: emblet, model number: MP12, manufactured by Unitika Ltd.) having one side subjected to Al vapor deposition as in Example 1 was applied to this heat-insulated portion with an epoxy resin adhesive. Pasted. Example 1 was repeated except that the area covered with the PET film was increased.

(Example 8)
In Example 8, in place of the 12 μm-thick PET film having an Al-deposited surface of Example 1, a sheet-like PP foam material having a thickness of 1 mm (Furukawa Electric Co., Ltd., trade name: Slim Ace, foaming ratio) : 30 times). The procedure was the same as in Example 1 except that a sheet-like PP foam material having a thickness of 1 mm was attached.

(Example 9)
Example 9 was the same as Example 8 except that a sheet-like PP foam material having a thickness of 2 mm (manufactured by Sekisui Chemical Co., Ltd., trade name: Softlon, expansion ratio: 20 times) was attached.

(Example 10)
In Example 10, a 10-mm-thick nonwoven fabric (manufactured by Sumitomo 3M Limited, trade name: Thinsulate) was used in place of the sheet-like foamed materials of Examples 8 and 9. The procedure was the same as in Examples 8 and 9, except that a nonwoven fabric having a thickness of 10 mm was attached.

(Example 11)
In Example 11, on one side of the sheet-like PP foamed material of Example 8 having a thickness of 1 mm (made by Furukawa Electric Co., Ltd., trade name: Slim Ace, expansion ratio: 30 times), Al vapor deposition was performed on one surface. A 12-μm-thick PET film (product name: emblet, model number: MP12, manufactured by Unitika Ltd.) was further adhered. Example 8 was carried out in the same manner as in Example 8 except that a PET film having a thickness of 12 µm was further adhered.

(Example 12)
In Example 12, as in Example 6, the upper half (15 cm × 30 cm) of the surface of panel 17 facing the panel 19 and the upper half of the surface of panel 19 facing the panel 17 (length). 15 cm x 30 cm in width) were used as heat insulating parts. However, in the upper half of the opening of the panel 19, a sheet-like PP foam material having a thickness of 1 mm (made by Furukawa Electric Co., Ltd., trade name: Slim Ace, foaming ratio: 30 times). Example 6 was the same as Example 6 except that the heat insulating material attached to the upper half of the panel 19 was changed.

(Example 13)
In the thirteenth embodiment, as in the first embodiment, the upper half (15 cm × 30 cm) of the surface of the panel 17 opposite to the panel 19 is used as a heat insulating part, and the heat insulating part is subjected to Al vapor deposition on one surface. The applied PET film having a thickness of 12 μm (product name: emblet, model number: MP12, manufactured by Unitika Ltd.) was affixed with an epoxy resin adhesive to obtain a heat insulation method.

  In the following Examples 14 to 16, the same heat insulating parts and the same heat insulating method as those of Example 13 were used.

  Similarly to the first embodiment, the lower half (15 cm long × 30 cm wide) of the surface of the panel 17 opposite to the panel 19 is used as a heat radiating portion. In this portion, ten holes having a diameter of 0.5 mm are provided. Opening (2 steps × 5 at equal intervals) and providing these ventilation holes was used as a heat dissipation method.

(Example 14)
In Example 14, as in Example 1, the lower half (15 cm × 30 cm) of the surface of the panel 17 facing the panel 19 was used as the heat dissipation portion. 10 parts by weight of zirconium oxide, 5 parts by weight of an oil-free polyester resin varnish (manufactured by Dainippon Ink and Chemicals, Inc., solid content 60%) and a polyisocyanate resin (manufactured by Nippon Polyurethane Industry Co., Ltd., solid content 70%) ) And 1 part by weight thereof were mixed and dispersed, further diluted with a solvent and adjusted for viscosity, and then uniformly spray-coated so as to have a dry film thickness of 20 µm. The emissivity of this coating is 0.89. Except that high emissivity coating was applied as the heat radiation method, the procedure was the same as in Example 1.

(Example 15)
In Example 15, both of the entire surface of the panel 17 facing the panel 19 (length 30 cm × width 30 cm) and the lower half of the surface of the panel 19 facing the panel 17 (length 15 cm × width 30 cm). Was defined as a heat radiation part. The paint used in Example 14 was applied to these heat radiation parts. Same as Example 14 except that the high emissivity coating was also applied to the upper half of panel 17 and the lower half of the opening in panel 19.

(Example 16)
In Example 16, the entire panel 17 (length 30 cm × width 30 cm) opposed to the panel 19 was used as a heat radiating portion. The panel 17 was replaced with a 0.2 mm-thick iron plate (thermal conductivity 60.5 W / mK) sandwiched between two 0.4 mm-thick PP resin plates. The emissivity of the coated part is 0.84. Example 15 was the same as Example 15 except that the configuration of the heat radiation part and the panel 17 was changed.

(Comparative Example 1)
As Comparative Example 1, a device that was not subjected to both the heat insulation treatment and the heat radiation treatment was manufactured.

(Comparative Example 2)
In Comparative Example 2, the entire surface (length 30 cm × width 30 cm) of the surface of the panel 17 facing the panel 19 of both surfaces of the panel 17 was used as the heat insulating portion in comparison with the examples 1 and 7. Similar to Examples 1 and 7, a 12 μm-thick PET film (product name: emblet, model number: MP12, manufactured by Unitika Ltd.) having one side subjected to Al vapor deposition was bonded to this heat-insulated portion by epoxy resin. Pasted with the agent.

(Comparative Example 3)
In Comparative Example 3, as compared to Example 5, the entire surface (length 30 cm × width 30 cm) of panel 19 facing panel 17 was used as a heat insulating portion. A 12 μm-thick PET film (product name: emblet, model number: MP12, manufactured by Unitika Ltd.) having one surface subjected to Al vapor deposition as in Examples 5 and 6 was bonded to this heat-insulated portion with an epoxy resin. Pasted with the agent.

(Comparative Example 4)
In Comparative Example 4, as compared with Example 8, the entire surface (length 30 cm × width 30 cm) of the surface of the panel 17 facing the panel 19, that is, the entire opening of the panel 17 was used as the heat insulating portion. A sheet-like PP foam material having a thickness of 1 mm (made by Furukawa Electric Co., Ltd., trade name: Slim Ace, foaming ratio: 30 times) was attached to this heat-insulating portion as in Example 8.

(Evaluation method)
The test apparatus in which the panels 17 and 19 were stacked as described above was placed on its side so that the panels 17 and 19 were along the vertical direction. The sun lamp 21 (manufactured by Celic Co., Ltd., artificial sun lamp Solax500) is placed at a depression angle of 45 ° with respect to the panel 19, the lower end of the sun lamp 21 is located at the upper height of the spacer heat insulator 20, and from the spacer heat insulator 20. It was arranged at a distance of 50 cm. The solar lamp 21 was irradiated for 120 minutes so that the light intensity at the center of the panel 19 was 1000 W / m2. Then, on the center line (15 cm from the end) of the surface (30 cm × 30 cm) of the panel 17 on the side of the internal space 16 at the time of irradiation for 120 minutes, the surface temperature at a position 5 cm from the top and the surface temperature at a position 25 cm from the top Was measured. Furthermore, each air temperature was measured at a position 10 cm away from each of the positions (5 cm from the top, 25 cm from the top) toward the internal space 16.

  FIG. 20 shows the measurement results of the example and the comparative example. In this diagram, the position 5 cm from the top is described as “upper”, and the position 25 cm from the top is described as “lower”.

  As is clear from comparison of the measurement results in each example and the measurement results in each comparative example, the temperature at the same position was much lower in each example than in each comparative example. .

  For example, comparing Example 1 in which the upper half of the panel 17 corresponding to the trim is heat-insulated and heat-dissipating the lower half is compared with Comparative Example 1 in which the heat-insulation and heat-dissipation processes are not performed, As compared with Comparative Example 1, the upper and lower surface temperatures and the upper and lower air temperatures could be reduced by 23.1 ° C., 16.5 ° C., 22.2 ° C., and 17.8 ° C., respectively.

  Comparing Example 1 with Comparative Example 2 in which the entire panel 17 is thermally insulated and not subjected to heat radiation processing, Example 1 is different from Comparative Example 2 in that the upper and lower surface temperatures, the upper and lower surface temperatures are lower. Each of the air temperatures could be reduced by 12.9 ° C, 9.9 ° C, 12.2 ° C, and 9.4 ° C.

  When comparing Example 7 in which 70% of the panel 17 was heat-insulated from the top and 30% in the bottom was heat-dissipated and Comparative Example 2, in Example 7, the upper and lower parts were lower than Comparative Example 2. The surface temperature and the upper and lower air temperatures could be reduced by 15.3 ° C, 14.7 ° C, 16.7 ° C, and 13.2 ° C, respectively.

  Example 5 in which the upper half of the panel 19 corresponding to the outer panel 1 was heat-insulated and the lower half of the panel 17 was heat-treated, and Comparative Example 3 in which the entire panel 19 was heat-insulated and heat treatment was not performed. When compared with Comparative Example 3, in Example 5, the upper and lower surface temperatures and the upper and lower air temperatures were 13.1 ° C., 11.3 ° C., 12.3 ° C., and 10.3 ° C., respectively. The temperature could be reduced by 5 ° C.

  Example 6 in which the upper half of the panel 17 and the panel 19 is heat-insulated and heat treatment of the lower half of the panel 17 is compared with Comparative Example 3 shows that Example 6 has a higher upper part than Comparative Example 3. And the lower surface temperature and the upper and lower air temperatures could be reduced by 12.6 ° C, 11.2 ° C, 11.9 ° C and 10.5 ° C, respectively.

  Example 8 and Comparative Example 4 are similar to Example 1 and Comparative Example 2 except that the heat insulation method is changed to a form in which a sheet-like PP foam material having a thickness of 1 mm is attached. In No. 8, the surface temperatures of the upper and lower portions and the air temperatures of the upper and lower portions could be reduced by 17.6, 13.9 ° C, 17.0 ° C, and 13.9 ° C, respectively, as compared with Comparative Example 4.

  As described above, a book that suppresses intrusion of heat into the vehicle compartment R from a portion of the outer panel 1 that is likely to receive heat and promotes heat radiation from the vehicle compartment R to the outside, thereby promoting indoor temperature comfort. The effect of the invention was confirmed.

  INDUSTRIAL APPLICABILITY The present invention can be applied to an application for improving the indoor temperature environment in a case where the vehicle is parked under the scorching sun.

It is a conceptual diagram which shows the heat transfer form at the time of parking of a general vehicle. It is a conceptual diagram which shows the heat transfer form at the time of parking of a general vehicle. It is a conceptual diagram which shows the heat transfer form at the time of parking of a general vehicle. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure used for description of the thermal functional structure for motor vehicles which concerns on this invention, Comprising: It is the longitudinal cross-sectional view which looked at the vehicle body from the front. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the thermal functional structure for motor vehicles which concerns on embodiment and Example 1, and is represented by the longitudinal cross section when the vehicle body is seen from the front. 1 is a schematic sectional view illustrating a door structure according to a first embodiment. FIG. 9 is a diagram provided for explanation of a second embodiment of the present invention. FIG. 13 is a diagram provided for explanation of a third embodiment of the present invention. FIG. 14 is a diagram provided for explaining a fourth embodiment of the present invention. It is a chart which shows the temperature measurement result in the comparative experiment of the air temperature of a room center, and the surface temperature of a head lining. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically the vehicle body panel structure for description of improvement of the indoor thermal environment by this invention. FIG. 12A is a schematic cross-sectional view showing an embodiment in which a high reflectivity material is provided on the upper part of the back surface of the outer panel, and FIG. 12B is the upper part of the surface (front surface) of the inner panel facing the outer panel. FIG. 12C is a schematic cross-sectional view illustrating an embodiment in which a high-reflectance material is provided, FIG. 12C is a schematic cross-sectional view illustrating an embodiment in which a high-reflectance material is provided on the upper portion of the back surface of the inner panel, and FIG. It is an outline sectional view showing the embodiment in which the high reflectance material was given to the upper part of the surface (back surface) which faces the outer panel of the door trim. FIG. 13A is a schematic cross-sectional view showing an embodiment in which a high-reflectance material is provided on each of the upper portion of the outer panel back surface and the upper portion of the inner panel surface, and FIG. 13B is the upper portion of the outer panel back surface and door trim. FIG. 13C is a schematic cross-sectional view showing an embodiment in which a high reflectivity material is provided on each of the upper portions of the back surface, and FIG. 13C shows high reflectivity on each of the upper portion of the outer panel back surface, the upper portion of the inner panel surface, and the upper portion of the door trim back surface. It is an outline sectional view showing an embodiment to which a material is added. FIG. 14A is a schematic cross-sectional view showing an embodiment in which a sheet-like heat insulating material is attached to the upper portion of the back surface of the outer panel, and a high-reflectance material is applied to the upper portion of the inner panel surface. FIG. It is a schematic sectional drawing which shows the embodiment to which the sheet-like heat insulating material was stuck on the upper part of the back surface of a panel, and then the high reflectance material was provided. FIG. 11 is a schematic cross-sectional view showing an embodiment in which a high-reflectivity material is provided as a heat insulating means to a position 10 cm below a boundary line formed by connecting a point at which an angle between a tangent on the surface of the outer panel and the ground is 90 °. FIG. 16A is a schematic cross-sectional view showing an embodiment in which ventilation holes are provided as heat radiating means in the lower part of the trim and the inner panel. FIG. 16B is a diagram showing the lower part of the inner panel surface and the lower part of the door trim rear surface. FIG. 16C is a schematic cross-sectional view illustrating an embodiment in which a coating material having a far-infrared emissivity of 0.7 or more on the applied surface is attached, and FIG. 16C is an embodiment in which a good thermal conductivity material is included in a trim. FIG. It is sectional drawing which shows the outer panel and the evaluation apparatus which imitated the indoor space. It is a table | surface which lists the heat insulation part and the heat insulation method in an Example and a comparative example in a list. 5 is a table showing a list of heat radiating portions and heat radiating methods in Examples and Comparative Examples. 9 is a table showing measurement results of Examples and Comparative Examples.

Explanation of reference numerals

1, 31 outer panel,
2,32 inner panel,
3,33 indoor trim,
4 glass,
5 High reflectivity material,
6 sheet insulation,
7 tangents,
8 borderline,
12 vents,
13 high emissivity materials,
14 Good thermal conductivity material,
15 Insulated box,
16 car room simulation space,
17 trim equivalent panel,
18 Spacer insulation,
19 Outer panel equivalent panel,
20 spacer-like heat insulating material,
21 Sunlight,
Reference Signs List 30 Door structure 34 Roof 35 Windshield 36 Side glass 37 Rear glass 38 Instrument panel 39 Rear parcel shelf 40 Seat 40a Seat seating surface 50 Body 51 Boundary 52 Upper body 53 Lower body 54 Door panel upper end 55 Side sill lower end 56 Ground surface 57 Vertical line 58 Vertical line 58a Substantially the center position of the vertical line 58b Position of 20% to 60% in length ratio upward from the lower end of the side sill with respect to the entire length of the vertical line 61 Means having heat insulation function 62 Means having heat dissipation function 64 Reflective heat insulating material 65 Reflecting material 66 Insulating material 67 Infrared absorbing paint (paint with high emissivity in far infrared region)
68 Mesh Structure 69 Floor 70 Heat Dissipation Carpet 71 Heat Collector 72 Heat Pipe 73 Heat Sink R Cabinets

Claims (36)

  A vehicle body for forming a compartment is divided into an upper body portion and a lower body portion with a substantially horizontal boundary line as a boundary. Means having a heat insulating function is provided at the upper body portion, while heat radiation is provided at the lower body portion. A thermal functional structure for an automobile, comprising means having a function.   2. The thermal functional structure for an automobile according to claim 1, wherein the boundary line is set at a substantially central position in a vertical line connecting the upper end of the door panel and the lower end of the side sill with a vertical line from the ground surface. 3.   The boundary line is a vertical line connecting the upper end of the door panel and the lower end of the side sill with a perpendicular line from the ground surface, and has a length ratio of 20% to 60% upward from the lower end of the side sill with respect to the entire length of the vertical line. The thermal functional structure for an automobile according to claim 1, wherein the thermal functional structure is set to:   The thermal functional structure for a vehicle according to claim 1, wherein the boundary is included in either the upper part of the vehicle body or the lower part of the vehicle body.   The thermal functional structure for a vehicle according to claim 1, wherein one or a plurality of the boundary lines are set.   The heat functional structure for an automobile according to claim 1, wherein the means having the heat insulating function includes at least one of heat insulating glass and / or heat ray reflective glass and heat insulating material.   The heat functional structure for an automobile according to claim 1, wherein the means having a heat radiation function includes at least one of a high heat conductive material, a high radiation material, and ventilation.   The upper part of the vehicle body provided with the means having the heat insulating function includes a roof, A, B, C, D pillars, a windshield, a side glass, a rear glass, an upper part of a door structure located above the boundary, and the boundary. The vehicle heat according to claim 1, further comprising at least one of an upper portion of a rear fender located above a line and an upper portion of a rear hatch door located above the boundary line. Functional structure.   The lower part of the vehicle body provided with the means having the heat dissipation function is a floor, a lower part of a door structure located below the boundary line, a lower part of a rear fender located below the boundary line, and the boundary. The thermal functional structure for an automobile according to claim 1, comprising at least one of a lower portion of the rear hatch door located below the line. The upper body includes a roof,
The heat functional structure for an automobile according to claim 1, wherein the means having the heat insulating function provided on the roof is made of a reflective heat insulating material. The upper part of the vehicle body includes A, B, C, D pillars, an upper part of a door structure located above the boundary line, an upper part of a rear fender located above the boundary line, and an upper part of the boundary line. Including at least one of the tops of the located rear hatch doors,
The means having a heat insulating function provided on these components is formed of a reflective material installed on the vehicle interior side of an outer panel constituting the exterior of the vehicle and / or on the outer side of an inner panel facing the outer panel. The thermal functional structure for a vehicle according to claim 1, wherein   The means having the heat insulating function provided on the upper part of the door structure, the upper part of the rear fender, or the upper part of the rear hatch door is further characterized in that a reflective heat insulating material is further installed on the exterior side of the interior trim. The thermal functional structure for an automobile according to claim 11. The upper body includes at least one of a windshield, a side glass, and a rear glass,
2. The heat for an automobile according to claim 1, wherein the means having a heat insulating function provided thereon is made of a glass material having at least one of a heat ray absorbing function and a heat ray reflecting function. Functional structure. The lower part of the vehicle body is a lower part of a door structure located below the boundary line, a lower part of a rear fender located below the boundary line, and a lower part of a rear hatch door located below the boundary line. Including at least one of the following:
The heat functional structure for a vehicle according to claim 1, wherein the means having a heat radiation function provided in these components is made of a paint having a high emissivity in a far-infrared region. The lower body includes a floor,
2. The thermal functional structure for an automobile according to claim 1, wherein the means having the heat radiation function provided on the floor is composed of a heat radiation carpet using a good heat conductive material. The lower body includes a floor,
The means having a heat radiation function provided on the floor includes a heat sink provided on the floor, and a heat pipe for performing heat transport between the instrument panel and / or the rear parcel shelf and the heat sink. The thermal functional structure for an automobile according to claim 1, wherein the thermal functional structure is configured to radiate heat from the vehicle. A vehicle body for forming a compartment is divided into an upper body portion and a lower body portion with a substantially horizontal boundary line as a boundary. Means having a heat insulating function is provided at the upper body portion, while heat radiation is provided at the lower body portion. Means having a function are provided,
Reduces heat input into the cabin from the part that receives direct sunlight, reduces radiation from the interior trim to the occupants, and promotes heat radiation from the part where the temperature difference with the external atmosphere occurs most to the outside of the cabin. Thus, a thermal functional structure for a vehicle that can reduce the temperature difference between the air temperature in the indoor upper space and the air temperature in the indoor lower space, and thereby lower the air temperature in the entire room. A vehicle body panel structure which is used for the thermal functional structure for a vehicle according to claim 1 and has a substantially vertical surface, wherein an outer panel constituting a vehicle exterior, an inner panel and an interior trim facing the outer panel are provided. In the body panel structure with
At least one of the back surface of the outer panel, the both surfaces of the inner panel, and the surface of the interior trim facing the outer panel is partially provided with a heat insulating means for heat insulation, so that the surface has a heat insulating function. And a heat dissipation function.   The position where the heat insulating means is provided is an upper part of the vehicle body when a vehicle body for forming a compartment is divided into an upper body part and a lower body part with a substantially horizontal boundary line as a boundary. Item 19. The vehicle body panel structure according to item 18.   20. The vehicle body panel structure according to claim 18, wherein heat radiating means for facilitating heat radiation is provided in at least a part of a part other than a part insulated by the heat insulating means.   The body panel structure according to any one of claims 18 to 20, wherein the heat insulating means is configured by attaching a low-emissivity film having a low emissivity in a far-infrared region with an adhesive. .   The low-emissivity film was coated with an aluminum foil, a copper foil, an aluminum foil whose surface was protected by a transparent resin layer, a copper foil whose surface was protected by a transparent resin layer, a resin film having aluminum adhered thereto, and a reflective paint. 22. The vehicle body panel structure according to claim 21, comprising at least one of a group consisting of a resin film, a resin material mixed with a reflection material and / or a white pigment.   The vehicle body panel structure according to any one of claims 18 to 20, wherein the heat insulating means is configured by applying a coating that reduces the emissivity of a coating surface in a far-infrared region.   24. The vehicle body panel structure according to claim 23, wherein the paint applied by coating to reduce the emissivity in the far-infrared region includes aluminum scales.   The vehicle body panel structure according to any one of claims 18 to 20, wherein the heat insulating means is configured by attaching a sheet-like heat insulating material.   26. The vehicle body panel structure according to claim 25, wherein the sheet-like heat insulating material is selected from the group consisting of a foamed resin sheet, a nonwoven fabric, and a woven fabric.   The boundary between the part providing the heat insulation function and the part providing the heat dissipation function is 15 cm above and below the boundary formed by connecting the point at which the angle between the tangent line on the surface of the outer panel and the ground becomes 90 °. The vehicle body panel structure according to any one of claims 18 to 26, wherein the vehicle body panel structure is within a width.   28. The method according to claim 27, wherein, when there are a plurality of the boundary lines, a boundary line closest to the ground is used as a reference line that defines a boundary between a portion providing a heat insulating function and a portion providing a heat radiation function. The body panel structure as described.   21. The vehicle body panel structure according to claim 20, wherein the heat radiating means is configured by providing a ventilation hole below the interior trim.   30. The vehicle body panel structure according to claim 29, wherein a ventilation hole as the heat radiation means is further provided in the inner panel.   21. The vehicle body panel structure according to claim 20, wherein the heat dissipating means is formed by applying a coating having an emissivity in a far-infrared region of a coating surface of 0.7 or more.   The coating applied by coating having an emissivity in the far infrared region of 0.7 or more is at least one selected from the group consisting of zirconium oxide, alumina, zircon, titania, aluminum titanate, cordierite, and aluminum silicate. 32. The vehicle body panel structure according to claim 31, comprising a high emissivity material.   21. The vehicle body panel structure according to claim 20, wherein the heat radiating means is configured by including a good heat conductive material in the interior trim.   The body panel structure according to claim 33, wherein the good heat conductive material is made of metal, carbon fiber, or a composite material containing them.   35. The vehicle body panel structure according to claim 33, wherein the good heat conductive material has a sheet shape or a net shape.   36. The vehicle body panel structure according to claim 35, wherein the good heat conductive material is included in the interior trim using an insert molding method.